A Dodge B250 Van does not have a mass airflow sensor.
I have a 1989 Dodge B250...it has overdrive
Generally, the 42RE, 46RE, 47RE (or RH versions), or the three-speeds
No.
Center of the firewall.
Yes
Yes.
Under the hood on firewall in center, above engine.
It is inside the distributor.
Black box under the hood by the battery
voltage regulator is part of the engine computer
Probably, if it's behind the same engine. Electrical connectors may not match, though, since one is OBD II PCM and one is not.